How Facebook is different from twitter?

Most of your friends on Facebook are relatives, childhood friends or people I know through work. Very few of them can be of any great help in my professional career, but we value them all very much as friends
On Twitter, however, the whole point is really to follow people you find interesting or have the same interests as you. As your interests for example revolve around subjects like the internet, social media, photography, film industry and such, we tend to follow people tweeting about those things. Similarly people with the same kind of interests tend to follow us, as we also tweet about these things.
There is a quote for this as well.
“Facebook is where you find the people you know Twitter is where you find the people you should know.”